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P = 20 ÷ 1/500
= 20 × 500/1
= 10000/1 = 10000 CM = 100 M
L = 18 ÷ 1/500
= 18 × 500/1
= 9000/1 = 9000 CM = 90 M
L persegipanjang = 100×90 = 9000 M
L=18 × 500=9.000 cm=90 m
L= 100 m × 90 m= 9.000 m²